SINUS PENTA
REGENERATIVE
APPLICATION
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2.4.
CHECKING THE REGENERATIVE DRIVE
DIMENSIONING
The dimensioning of the regenerative drive for your application is given in the application tables above. If a
special application is not included in the tables, you need to check the regenerative drive dimensioning: the
power exchanged with the mains—both in continuous operation and when the drive is overloaded—must be
lower than or equal to the drive rated power and peak power respectively.
a) Continuous Operation
The power exchanged with the mains in continuous operation (Pconrgn) is as follows:
Pconrgn= Pmot + motor drive loss + regenerative drive loss.
- Pmot is the electric power absorbed by the motor;
- Loss values are given in the tables containing the drive specifications (the motor drive loss is supposed to be
the same as the regenerative drive loss).
The electric power absorbed by the motor can be calculated as follows:
Pmot= Mechanical power/motor performance
or
Pmot=1.73*Vmot*Imot*cosphimot
where:
Vmot: rated motor voltage
Imot: rated motor current
cosphimot: rated motor power factor
b) Overload
The power obtained when the drive is overloaded (Polrgn) is as follows:
Polrgn= overloaded motor drive loss + overloaded regenerative drive loss
The electric power required when the motor is overloaded is as follows:
Polmot=1.73*Vmot*Ilim*cosphimot
where Ilim is the limit current for the drive controlling the motor.
Loss values are given in the tables containing the drive specifications (the motor drive loss is supposed to be
the same as the regenerative drive loss) and should be increased by the ratio between the overload current
and the rated current (Ilim/Imot).